service letter sl s1840501-25-05

SERVICE LETTER
Kannad Emergency Locator Transmitter
The information and instructions contained in this document have been produced in accordance with alternative procedure to DOA EASA AP058.
KANNAD 406 AF-COMPACT
KANNAD 406 AF-COMPACT (ER)
INTEGRA ELTs Family
GUIDELINES FOR PERIODIC INSPECTION
1. REASON
Testing the various elements of KANNAD AF-COMPACT ELTs and INTEGRA ELTs is
mandatory every 6 years together with the battery replacement. The only periodic check
required by Orolia S.A.S. is the monthly self-test as described in the Installation/Operation
manual. However some Civil Aviation Authorities may require the ELT be tested periodically.
Periodicity and List of applicable tests are defined by local regulations.
The following guidelines are provided by Orolia S.A.S. to describe usual operations required
by major Aviation Authorities.
It is the responsibility of the Customer to determine which tests are applicable to its ELT.
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2. DESCRIPTION
A. USA
The following regulation apply to USA
USA: FAR 91.207 paragraph (d): “Each emergency locator transmitter [...] must be inspected
within 12 calendar months after the last inspection for -(1) Proper installation;
(2) Battery corrosion;
(3) Operation of the controls and crash sensor; and
(4) The presence of a sufficient signal radiated from its antenna.”
B. CANADA
The following regulation apply to CANADA
CAR Part VI - Standard 625 Appendix C – 12 (a):
[...] the ELT shall be inspected at intervals not exceeding 12 months, in accordance with
Standard 571 of the CARs.
CAR Part V - Standard 571 Appendix G:
Maintenance of Emergency Locator Transmitters (ELTs)
(a) Corrosion Inspection
(b) Operational Testing
(c) (3) Performance Testing
(c) (3) (a) measured peak power after 3 minutes of operation;
(c) (3) (b) measured frequency after 3 minutes of operation;
(c) (3) (c) audio modulation,
(c) (3) (d) measured current draw
(c) (3) (e) test of the automatic activation system.
C. Other Countries
Other countries: refer to local regulations.
D. Special Airworthiness Information Bulletin
Special Airworthiness Information Bulletin (SAIB) HQ-12-32 has informed emergency locator
transmitter manufacturers as well as installers and aircraft maintenance personnel of a concern
with the ability of hook and loop style fasteners to retain their designed capability to restrain
emergency locator transmitters during accident impact. In several recent aircraft accidents,
ELTs mounted with hook and loop style fasteners, commonly referred to as Velcro®, have
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detached from their aircraft mounting. The separation of the ELT from its mount caused the
antenna connection to sever, rendering the ELT ineffective.
For ELT manufacturers who previously utilized hook and loop style fasteners for ELT retention,
FAA recommends they include the following information in their ICA:
1. Instructions for properly securing the ELT during installation and reinstallation as well as
a method to determine the appropriate tension of the hook and loop style fasteners.
2. Instructions for inspecting hook and loop style fasteners for wear, contamination,
environmental degradation, or other effects to ensure they will continue to meet the
requirements in the applicable TSO. Incorporating this inspection with the inspection
required by 14 CFR § 91.207 is appropriate.
3. Replacement interval for the hook and loop style fasteners.
CAUTION:
AN INCORRECT TIGHTENING OF THE HOOK AND LOOP FASTENER COULD LEAD TO
AN UNSAFE SITUATION PREVENTING THE TRANSMISSION OF THE DISTRESS
MESSAGE BY THE ELT
3. EFFECTIVITY
This Service Letter is applicable to the following types of ELTs manufactured by KANNAD:
Type of ELT
P/N
KANNAD 406 AF-COMPACT
S1840501-01
KANNAD 406 AF-COMPACT (ER)
S1840501-04
AP INTEGRA (ER)
S1850501-01
AP INTEGRA
S1850501-02
AF INTEGRA (ER)
S1851501-01
AF INTEGRA
S1851501-02
AF-H INTEGRA (ER)
S1852501-01
AF-H INTEGRA
S1852501-02
AP-H INTEGRA (ER)
S1854501-01
AP-H INTEGRA
S1854501-02
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Kannad Emergency Locator Transmitter
4. TOOLS
A. Standards and Specific Tools
Depending on the tests to be performed, the following tools may be required:
 50 Ohm BNC Load, 1 Watt.
 COSPAS-SARSAT Decoder [any decoder capable to decode a COSPAS-SARSAT digital
message compatible with 406.028 MHz (KANNAD 406 AF-COMPACT) or 406.037 MHz
(INTEGRA ELTs) frequency, also called “Beacon Tester”].
 121.5 MHz VHF receiver (Aircraft VHF receiver may be used).
 Oscilloscope or digital voltmeter.
 Frequency meter (or any device able to measure the frequency of the 121.5MHz
 Wattmeter (or any device able to measure the power of the 121.5MHz
 Annual inspection kit P/N S1840510-02 (see below) and/or Tank capable to contain
sufficient water to perform a check of ELT tightness.
 Torque-limiting driver with T10 bit for Torx® head screws (hexalobular screws).
The following tools are required only if current draw measurement is performed:
 6.5 V DC power supply, current 5 A.
 Plug 2 pin female VHR-2N JST with 2x Pin female : SVH-21T-P1.1 JST
 Ammeter.
B. Annual Inspection Kit
NOTE: The use of the annual inspection kit is mandatory:
 if the ELT has to be opened and a water tightness test is not performed or,
 if the ELT has to be opened and the screws were damaged during removal, in this case they
have to be replaced by screws available in the kit.
If a water tightness test is performed and if the screws are not damaged during removal, the
use of annual inspection kit is recommended but not mandatory.
O ring
Annual inspection kit
P/N S1840510-02
Nylstop
nuts
Torx
screws
Seal
label
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Dessicant
capsule
Inspection
label
(EES01928
)
Inspection
label
(EES01923
)
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5. PROCEDURE ACCORDING TO FAR91.207
NOTE: Except when explicitly mentioned, always let the switch on «OFF» position during
inspection.
A. Proper Installation
 Remove the ELT from its mounting bracket (refer to relevant operation and installation
manual).
 Inspect the mounting bracket and the ELT: ensure the mounting bracket and the ELT are
free of cracks or other obvious damage.
 Check that the strap does not show traces of wear and tear due to ageing.
 Inspect the connector: visually inspect all pins of connector.
B. (Battery corrosion) / Battery Voltage Measurement
IMPORTANT: The ELT is hermetically closed. If it is not absolutely mandatory, KANNAD
recommends not opening the ELT.
Due to the technology used for Kannad ELTs and battery packs, any corrosion between two
battery replacements is unlikely to happen. KANNAD recommends an alternative way of
checking the batteries by measuring the voltage of the battery without opening the ELT.
If it is mandatory to open the ELT for a visual inspection of the battery, refer to Section 6
PROCEDURE ACCORDING TO CAR Part V - Standard 571 Appendix G, B. Corrosion
Inspection.
(1) Battery voltage measurement
(a) Connect a 50 Ohm load to the ANT receptacle.
(b) Connect the oscilloscope probe or digital voltmeter with max./min. recording between
contact A (RCP TEST RESET) and G (RCP COMMON) of ELT’s DIN-12 socket.
Figure 1: DIN-12 Connector Pin-Out
(c) Do a self-test on the ELT (switch to ARM).
(d) Measure the battery voltage with an oscilloscope (slow scan) or digital voltmeter with
max./min. recording and check the voltage during the 406 MHZ transmission.
(e) Record the minimum voltage
(f) The measured voltage must be more than 5.1 VDC
Note: the minimum voltage must be recorded during the 406 MHZ transmission (duration
440ms for KANNAD 406 AF-COMPACT or 520 ms for INTEGRA ELTs). If the MIN HOLD
feature of the voltmeter is activated before the switch to ARM, the voltmeter will record ~0V as
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minimum voltage. The MIN HOLD must be activated right after the ELT has been switched to
ARM.
C. Operation of the Controls and Crash Sensor
(1) Operation of controls and crash sensor for automatic ELTs
IMPORTANT: Do not operate for more than 50 seconds.
(a) Connect a 50 Ohm load to the «ANT» receptacle.
(b) Switch to «ARM» and wait for the end of the self-test.
(c) Check operation of the crash sensor:
-
For KANNAD 406 AF Compact and AP / AF INTEGRA, cause abrupt move of the
ELT towards the front (refer to flight direction arrows on upper label of ELT).
-
For AP-H INTEGRA and AF-H INTEGRA, cause abrupt move of the ELT towards the
front with the ELT having a 45-degree upward tilt
(d) Make sure that the ELT operates (aural and visual indicator activated).
(e) Switch the ELT to «OFF».
(f) Disconnect the 50 Ohm Load.
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(2) Operation of controls for automatic ELTs with RCP
These tests have to be performed
with the Remote Control Panel (RCP).
 Re-install the ELT onto its
mounting bracket (Refer to § (4) Install the ELT
onto its mounting bracket)
 Connect the outside antenna and RCP to the ELT.
 Perform RCP operational tests:
Refer to Figure 2: Operation of
controls with RCP.
Figure 2: Operation of Controls with RCP
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D. Presence of a Sufficient Signal Radiated from its Antenna
If not previously installed for operation of controls, re-install the ELT onto its mounting bracket
(Refer to § (4) Install the ELT onto its mounting bracket).
Connect the outside antenna to the antenna connector of the ELT.
(1) 406 MHz transmission test (optional)
Although this test is optional according to FAR 91.207, Kannad recommends performing this
test if possible.
This test must be carried out with a COSPAS-SARSAT decoder.
When performed a few meters away from the ELT antenna, this test also validates the
antenna radiation.
(a) Perform a self-test.
(b) Check with the COSPAS-SARSAT decoder that, except for the 5th and the 6th digits, the
decoded message is identical to the programmed message.
NOTE: The message transmitted during self-test sequence always begins with FF FE D0
whereas a programmed message begins with FF FE 2F.
Example of message programmed in ELT with KANNAD 406 AF COMPACT / COMPACT
(ER):
FF FE 2F 53 C3 24 97 38 0B A6 0F D0 F5 20
Example of same message decoded by Cospas-Sarsat Decoder:
FF FE D0 53 C3 24 97 38 0B A6 0F D0 F5 20
Example of message programmed in ELT with INTEGRA ELTs:
FF FE 2F 96 E3 AF 0F 0F 7F DF FF 62 60 B7 83 E0 F6 6C
Example of same message decoded by Cospas-Sarsat Decoder:
FF FE D0 96 E3 AF 0F 0F 7F DF FF 62 60 B7 83 E0 F6 6C
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(2) 121.5 MHz transmission test
This test must be carried out with a VHF receiver.
If the antenna was already validated with the 406 MHz transmission test (see above), the on
board aircraft VHF receiver may be used.
If a 406 MHz transmission test was not performed (no Cospas-Sarsat decoder) another VHF
receiver must be used, placed at a distance of at least 10 meters (30ft ), in order to validate
the antenna.
(a) Check that the antenna is correctly connected.
(b) Tune aircraft radio to 121.5 MHz and ensure you can hear it:
(c) Switch from position «OFF» to position «ARM» or press RESET & TEST on the Remote
Control Panel (ensure that the ELT switch is in position «ARM»).
(d) Close to the end of self-test a short (3-4 sweeps) 121.5 transmission is made. Check on
the VHF receiver that the 121.5 signal is received with a strong level.
NOTE: at the end of the self-test, the test result is displayed with the red visual indicator and
the buzzer will sound:
 One long flash indicates that the system is operational and that no error conditions were
found.
 A series of short flashes indicates the test has failed.
The number of flashes gives an indication of the faulty parameter detected during the selftest.
 3+1 LOW BATTERY VOLTAGE.
 3+2 LOW RF POWER.
 3+3 FAULTY VCO LOCKING (FAULTY FREQUENCY).
 3+4 NO IDENTIFICATION PROGRAMMED.
 3+5 FAULTY VSWR (LINK TO EXTERNAL ANTENNA), for INTEGRA ELTs only.
 3+6 INTERNAL GPS SERIAL LINK, for INTEGRA ELTs only.
NOTE: The short 121.5 MHz transmission may be received by a nearby control
tower. According to your local regulations, it may be recommended to conduct this
test during the first five minutes of any UTC hour.
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6. PROCEDURE ACCORDING TO CAR Part V - Standard 571
Appendix G
A. Operational Testing
Note: the operational testing must be performed with the ELT closed and installed in the
aircraft. The person who performs maintenance can choose to conduct this test before or after
the corrosion inspection and performance testing.
Refer to:
 Section 5. PROCEDURE ACCORDING TO FAR91.207,5.C.(2) Operation of controls for
automatic ELTs with RCP
 Section 5. PROCEDURE ACCORDING TO FAR91.207, 5.D. Presence of a Sufficient Signal
Radiated from its Antenna.
B. Corrosion Inspection
IMPORTANT: Do not keep the beacon opened more than 2 hours if the annual
inspection kit is not used (replacement of desiccant).
(1) Remove the Front Panel assembly (1)
Refer to Figure3: Removal of Front Panel Assembly and Battery Pack.
CAUTION:
ESD PRECAUTIONS: ELECTROSTATIC SENSITIVE DEVICES (ESD).
NOTE: discard screws (2), nuts (3), O-ring (6) and desiccant capsule (7) if the annual
inspection kit is used.
(a) Remove the four screws (2) and nuts (3) that hold the front panel assembly (1).
(b) Carefully extract the front panel assembly (1) up to reach the battery connector.
NOTE: This will break the seal label (4).
(c) Disconnect the battery connector.
(d) Remove the front panel assembly (1) from the housing (5).
(e) Remove the O-ring (6) of the front panel assembly (1).
(f) Remove the desiccant capsule (7) from the foam (8).
(2) Remove the battery pack (9) from the housing
CAUTION: NEVER REMOVE THE BATTERY BY PULLING THE WIRES.
(3) Inspect the battery pack and the PCB
The battery pack and the PCB should be free of corrosion or other visible damage.
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Figure 3: Removal of Front Panel Assembly and Battery Pack
C. Performance testing
Measured peak power after 3 minutes of operation
(a) Connect a power meter to the ANT receptacle. (Note: every 50s, a 406 MHZ burst will
be transmitted with a level of 37dBm ± 2dB (5W). Ensure that the input of the power meter
can accept this power.)
(b) Set the ELT to the ON position
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(c) Make sure that after 3 minutes of operation the peak output power at 121.5MHz is
higher than +20dBm (100mW)
Measured frequency after 3 minutes of operation
(a) Connect a frequency meter to the ANT receptacle. (Note : every 50s, a 406 MHZ burst
will be transmitted with a level of approx 37dBm (5W). Ensure that the input of the
frequency meter can accept this power.)
(b) Set the ELT to the ON position
(c) Make sure that after 3 minutes of operation the frequency at 121.5MHz is 121.5MHz ±
0.006MHz
Audio modulation
Refer to “Operational testing” section: the audio control of the modulated signal during the
121.5MHz transmission (self-test) is sufficient.
Current draw measurement in ARM and ON positions
(a) Set up the test model for current measurement (see figure below). Note : the ELT
battery pack can also be used instead of a 6.5VDC power supply.
Figure 4: Test model for current measurement
(b) Connect the 2 pins female plug of the test model to the electronic PCB.
(c) Connect an ammeter with a range more than 5A to pins A1 and A2 of the test model.
(d) If available select the "MAX HOLD" function.
(e) Make sure that a 50 Ohms load (or a powermetre) is connected to the BNC output of
the ELT.
(f) Set the ELT to the ON position:
The ELT perform a self-test
(g) Measure the maximum current after the self-test procedure: during the 406 MHz burst
(duration approx 500 ms:
Current maximum value must be 5 A.
(h) Set the ELT to the OFF position before 50 seconds.
(i) Set the ELT to the ARM position:
The ELT perform a self-test.
(j) Connect S1 to S2 (put a jumper).
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(k) Replace the ammeter by a micro-ammeter (range 100 microA).
(l) Disconnect S1 from S2 (remove the jumper).
(m) Measure the maximum current after the self-test procedure:
Current must be less than 30 microA.
(n) Set the ELT to the OFF position.
Automatic activation system
Refer to Section 5. PROCEDURE ACCORDING TO FAR91.207,5.C.(1) Operation of
controls and crash sensor for automatic ELTs
D. Assembly
(1) Reinstall the battery pack
NOTE: Ensure that all parts (front panel, housing and O-ring are clean and dust-free).
Replace screws (2), nuts (3), O-ring (6) and desiccant capsule (7) if the annual inspection kit
is used.
(a) Install the battery pack (9) into the housing (5).
(b) Insert the desiccant capsule (7) into the hole of the foam (8) stuck on the front panel.
NOTE: Install cardboard side of capsule towards PCB, plastic side towards lower part of the
housing.
(c) Clean the groove of front panel with dry compressed air (to remove dust).
(d) Put the O-ring (6) into the groove of the front panel (1).
(2) Install the front panel assembly (1)
(a) Connect the connector of the battery pack (9) to the electronic PCB of the front panel
assembly (1).
(b) Insert the front panel assembly (1) into the slides of the housing (5) and slide it into the
housing taking care not to pinch the wires of the battery pack.
(c) Screw the front panel assembly (1) to the housing (5) with the 4 screws (2) and nuts (3).
Torque to 1 newton.meter ± 0.06 (8.85 pound-force inch ± 0.53).
(d)When using the annual inspection kit, affix a new seal label (4) onto the upper side of the
front panel assembly and the housing.
(3) Check ELT Tightness
NOTE: ELT Tightness test is not mandatory when the annual inspection kit is used (Refer to
Section 4.TOOLS, B. Annual Inspection Kit).
 Set the ELT to the OFF position.
 Soak the ELT vertically in a tank that contains sufficient water at 60 degrees Celsius ± 5
degrees Celsius to cover the ELT.
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 Make sure that, after 5 minutes, no string of air bubbles is released from:
the bearing surfaces of the seals;
the side that has the connectors, the switch and the LED;
the attaching points (screws).
Take the ELT out of the water and dry it.
NOTE: Some air bubbles can escape, in particular those caught in the hollow areas of the
shaped edge.
If there is a leak, remove the ELT from the water rapidly and open it to remove all signs of
moisture, then find the cause of the leak and correct as necessary.
(4) Install the ELT onto its mounting bracket
4.1. ELT installed with Mounting Bracket S1840502-01
1. Before installing the ELT onto its mounting bracket, check that the HOOK fastener of the
self-stripping strap is correctly positioned on the LOOP fastener of the mounting bracket.
Check that the strap does not show traces of wear and tear due to ageing.
2. Mount the transmitter on the bracket "Flight direction" arrow pointed towards the front of
the aircraft.
3. Slide the self-stripping strap through the buckle.
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4. Ensure the buckle is correctly positioned (indifferently on right or left side of ELT)
regarding the horizontal center line of ELT and firmly adjust and tighten the retaining
strap.
5. IMPORTANT:
Once installed in the mounting bracket, the installer must be sure that the
transmitter is firmly attached in its bracket by trying to extract it manually, thereby
verifying there is no play and that it remains attached when extraction from the
bracket is attempted.
6. CAUTION
“Caution: an incorrect tightening of the hook and loop fastener could lead to an
unsafe situation preventing the transmission of the distress message by the ELT.”
4.2. ELT AF types installed with Mounting Bracket S1840502-02
1. Mount the transmitter on the bracket "Flight direction" arrow pointed towards the front of
the aircraft
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2. Slide the self-stripping strap through the buckle
3. Firmly adjust and tighten the retaining strap
4. IMPORTANT:
Once installed in the mounting bracket, the installer must be sure that the
transmitter is firmly attached in its bracket by trying to extract it manually, thereby
verifying there is no play and that it remains attached when extraction from the
bracket is attempted.
5. CAUTION
“Caution: an incorrect tightening of the hook and loop fastener could lead to an
unsafe situation preventing the transmission of the distress message by the ELT.”
(4) Connect ELT to Antenna and RCP
Connect the ELT to the antenna connection cable and to the RCP cable (when applicable).
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7. PAPERWORK
 Update the inspection label with inspection date (today date) in MM/YYYY format.
 Update the next control date according to your regulation (MM/YYYY).
Orolia S.A.S. does not require any other paper work. Refer to your local regulation for other
paperwork requirements.
8. CONTACT
For any further information, please feel free to contact our customer support at:
Orolia S.A.S. Customer Service
Zone Industrielle des Cinq Chemins CS10028
56520 GUIDEL
FRANCE
E-mail: support.sar@orolia.com
Tel.: +33 (0)2 97 02 49 00
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